Genetic Variant NM_000080.4:c.1323C>A (chr17-4899004-G-T) – ACMG Classification: Likely_benign (-3 pts)

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2BP4_StrongBP7

The NM_000080.4(CHRNE):c.1323C>A(p.Gly441Gly) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000693 in 1,443,392 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. G441G) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 6.9e-7 ( 0 hom. )

Consequence

CHRNE
NM_000080.4 synonymous

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -0.993

Publications

0 publications found

Variant links:

Genes affected

CHRNE (HGNC:1966): (cholinergic receptor nicotinic epsilon subunit) Acetylcholine receptors at mature mammalian neuromuscular junctions are pentameric protein complexes composed of four subunits in the ratio of two alpha subunits to one beta, one epsilon, and one delta subunit. The acetylcholine receptor changes subunit composition shortly after birth when the epsilon subunit replaces the gamma subunit seen in embryonic receptors. Mutations in the epsilon subunit are associated with congenital myasthenic syndrome. [provided by RefSeq, Sep 2009]

CHRNE Gene-Disease associations (from GenCC):

congenital myasthenic syndrome
Inheritance: AR Classification: DEFINITIVE Submitted by: Illumina
congenital myasthenic syndrome 4A
Inheritance: AD, AR Classification: STRONG Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), PanelApp Australia
congenital myasthenic syndrome 4B
Inheritance: AR Classification: STRONG Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), PanelApp Australia
congenital myasthenic syndrome 4C
Inheritance: AR Classification: STRONG Submitted by: Genomics England PanelApp
postsynaptic congenital myasthenic syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

CHRNE links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.52).

BP7

Synonymous conserved (PhyloP=-0.993 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000080.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CHRNE	NM_000080.4	MANE Select	c.1323C>A	p.Gly441Gly	synonymous	Exon 11 of 12	NP_000071.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
CHRNE	ENST00000649488.2	MANE Select	c.1323C>A	p.Gly441Gly	synonymous	Exon 11 of 12	ENSP00000497829.1
CHRNE	ENST00000649830.1		c.390C>A	p.Gly130Gly	synonymous	Exon 11 of 11	ENSP00000496907.1
CHRNE	ENST00000572438.1	TSL:5	n.1009C>A		non_coding_transcript_exon	Exon 6 of 7

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.0000138

AC:

AN:

216802

AF XY:

0.0000170

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000208

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

6.93e-7

AC:

AN:

1443392

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

716232

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33288

American (AMR)

AF:

0.00

AC:

AN:

41924

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25694

East Asian (EAS)

AF:

0.00

AC:

AN:

39114

South Asian (SAS)

AF:

0.0000120

AC:

AN:

83190

European-Finnish (FIN)

AF:

0.00

AC:

AN:

50242

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5744

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1104432

Other (OTH)

AF:

0.00

AC:

AN:

59764

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.52

CADD

Benign

4.5

(source)

DANN

Benign

0.87

PhyloP100

-0.99

PromoterAI

-0.0051

Neutral

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over